Mamono ('''魔物''') is a [[Languages|Youkai-go]] term which means "evil spirit". It is a category of creatures that have appeared in the Mazes alongside [[youkai]], which possess a range of magical abilities and traits. Whereas youkai are sapient, civilized creatures that have integrated into society and communities, mamono are feral monsters residing in the Uncivilized Area, being one more category of dangerous creatures that can be found there.
Jami is a Youkai-go term which can be transliterated translated to "wicked spirit".
The jami is perhaps the ur-example of a mamono; the very name of the species being synonymous with this term. The specific creature referred to as a jami is the youngest of the forms that this creature can take. They evolve into their mature [[daijami]] form after 30 years, and into their elder [[oujami]] form after 60 years. Their total life expectancy is around 120 years, although it is rare for these creatures to die of old age.